package com.ck.framework.interceptor.impl;

/**
 * @author ck
 * @date 2023/9/4 16:13
 */

import com.alibaba.fastjson2.JSON;
import com.ck.common.annotation.RepeatSubmit;
import com.ck.common.constant.CacheConstants;
import com.ck.common.filter.RepeatedlyRequestWrapper;
import com.ck.common.utils.http.HttpHelper;
import com.ck.common.utils.jwt.RedisCache;
import com.ck.common.utils.txt.StringUtils;
import com.ck.framework.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 *
 */
 @Component
 public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {

    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";

    // 令牌自定义标识
    @Value("${token.header}")
    private String header;

    @Autowired
    private RedisCache redisCache;
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation) {
       String nowParams = "";
       if (request instanceof RepeatedlyRequestWrapper)
       {
          RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
          nowParams = HttpHelper.getBodyString(repeatedlyRequest);
       }

       // body参数为空，获取Parameter的数据
       if (StringUtils.isEmpty(nowParams))
       {
          nowParams = JSON.toJSONString(request.getParameterMap());
       }
       Map<String, Object> nowDataMap = new HashMap<String, Object>();
       nowDataMap.put(REPEAT_PARAMS, nowParams);
       nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

       // 请求地址（作为存放cache的key值）
       String url = request.getRequestURI();

       // 唯一值（没有消息头则使用请求地址）
       String submitKey = StringUtils.trimToEmpty(request.getHeader(header));

       // 唯一标识（指定key + url + 消息头）
       String cacheRepeatKey = CacheConstants.REPEAT_SUBMIT_KEY + url + submitKey;

       Object sessionObj = redisCache.getCacheObject(cacheRepeatKey);
       //缓存不为空就去比较是某个时间内是否是同样的url和请求参数
       if (sessionObj != null)
       {
          Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
          if (sessionMap.containsKey(url))
          {
             Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
             if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap, annotation.interval()))
             {
                return true;
             }
          }
       }
       Map<String, Object> cacheMap = new HashMap<String, Object>();
       cacheMap.put(url, nowDataMap);
       redisCache.setCacheObject(cacheRepeatKey, cacheMap, annotation.interval(), TimeUnit.MILLISECONDS);
       return false;
    }

   /**
    * 判断参数是否相同
    */
   private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap)
   {
      String nowParams = (String) nowMap.get(REPEAT_PARAMS);
      String preParams = (String) preMap.get(REPEAT_PARAMS);
      return nowParams.equals(preParams);
   }

   /**
    * 判断两次间隔时间
    */
   private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap, int interval)
   {
      long time1 = (Long) nowMap.get(REPEAT_TIME);
      long time2 = (Long) preMap.get(REPEAT_TIME);
      if ((time1 - time2) < interval)
      {
         return true;
      }
      return false;
   }
}
